6.0.9

msitarzewski/agency-agents6.0.9Sep 1, 2026by emscripten-bot

Upgrading?

AI Summary

Emscripten 6.0.9 marks the `WASM_BINDGEN` setting as experimental and optimizes streaming performance for cross-origin storage operations by utilizing `instantiateStreaming`.

Key Highlights

  • The `WASM_BINDGEN` setting is now marked as experimental with compiler warnings.
  • Cross-origin storage cache paths now use `WebAssembly.instantiateStreaming()` for better overlap.
  • Improvements to `Blob.stream()` and `tee()` usage for download/compile overlap.

New Features

  • Experimental `WASM_BINDGEN` setting.
  • Optimized streaming for cache-hit and cache-miss paths using modern browser APIs.

Full Release Notes

## What's Changed
- The `WASM_BINDGEN` setting is now marked experimental, and enabling it
  produces a compiler diagnostic warning, since the integration is still
  evolving and subject to change. (#27616)
- The `-sCROSS_ORIGIN_STORAGE` cache-hit and cache-miss paths now use
  `WebAssembly.instantiateStreaming()` (via `Blob.stream()` and a `tee()`'d
  network body respectively), so enabling the flag no longer loses the
  download/compile overlap of the standard streaming path. (#27609)


## Contributors
Thanks to the following contributors: @sbc100 (17) @brendandahl (3) @guybedford (3) @tomayac (2) @dschuff (1)

**Full Changelog**: https://github.com/emscripten-core/emscripten/compare/6.0.8...6.0.9

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